[DOC] document spread-checks
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 86f3f33..994df07 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -47,6 +47,7 @@
- nopoll
- nosepoll
- tune.maxpollevents
+ - spread-checks
* Debugging
- debug
@@ -164,6 +165,13 @@
latency at the expense of network bandwidth, and increasing it above 200
tends to trade latency for slightly increased bandwidth.
+spread-checks <0..50, in percent>
+ Sometimes it is desirable to avoid sending health checks to servers at exact
+ intervals, for instance when many logical servers are located on the same
+ physical server. With the help of this parameter, it becomes possible to add
+ some randomness in the check interval between 0 and +/- 50%. A value between
+ 2 and 5 seems to show good results. The default value remains at 0.
+
1.3) Debugging
---------------